The 25 hardest video games ever

Berzerk (1980) was a multi-directional arcade game in which players navigate mazes, killing robots and avoiding the terrifying Evil Otto. Evil Otto was a giant smiley face who pursued the player across the maps, and couldn't be killed. It was a challenging game in its own right, but it's the game's legacy which makes this possibly the hardest game of all time. In 1981, after posting a high score, 19 year old Jeff Dailey died of a heart attack. In October of the following year, after posting two top ten scores, 18 year old Peter Burkowski also died of a heart attack.